39.91% is the change from 639 to 894
Calculation steps:
[( 894 - 639 ) ÷ 639] x 100 = 39.91%
Formula
Percentage change = [(894 - 639) / 639] x 100
Subtract the new number by the original number
894 - 639 = 255
255 ÷ 639 = 0.39906103286384975
0.39906103286384975 x 100 = 39.91%